Hi Tony, Thanks! - that was very helpful. When you said "quite a fiddle" you weren't kidding ... but on the + side, it gets easier after about the third time... Problem turned out to be mechanical, a combination of dirt/aging lubricants in the mechanics which slide the head/capstan in and out, and dirty contacts in the position detector leaf switch. After cleaning and lubricating the mechanical parts, and cleaning and adjusting the switch (which is quite finicy - hence the "several times" - it's more fun to take apart with a tape stuck in it) ... the drive is working fine now, and the HX-20 is saving and loading programs like it was new! Thanks again & regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html